A couple of month ago my friend had to move and gave me his tiger barbs. I had already had tiger barbs so I knew what they needed. One in particular looked very ugly and had a big belly and my friend said that the fish had that belly since it was a baby. I let it go. Today in the morning it was dying at the bottom of my tank. Nitrates and ammonia levels were good and upon closer inspection I realized that this fish has part of his face missing, and I realized he was always like this. Now I’m curious to know what this fish had and why he might of died.